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HVACTemplate:Zone:IdealLoadsAirSystem tries to make things simple for you and it automatically creates a ZoneControl:Humidistat object which is causing the duplicate humidistat error. You can see this by looking at the expidf output file.
If you have fixed humidity setpoints, then put these values in the HVACTemplate:Zone:IdealLoadsAirSystemfields for "Humidification Setpoint" and "Dehumidification Setpoint", and delete the ZoneControl:Humidistat object in the idf.